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%I #4 Nov 25 2014 12:38:51
%S 11,17,23,37,41,97,101,121,137,157,191,211,223,227,331,347,431,443,457
%N Prime powers related to minimal visibility in the square n X n lattice.
%C So far 121 is the only composite here. The numbers in A141249 greater than 1 are 2*a(n)-1.
%Y Cf. A141246.
%K nonn
%O 1,1
%A _T. D. Noe_, Jun 17 2008